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304 HVAC Drive H300
Issue Number: 3
Phase Loss Supply phase loss
32
This trip indicates that the drive has detected an input phase loss or large supply imbalance. Phase loss can be detected
directly from the supply where the drive has a thyristor base charge system (Frame size 7 and above). If phase loss is
detected using this method the drive trips immediately and the xx part of the sub-trip is set to 01. In all sizes of drive phase
loss is also detected by monitoring the ripple in the DC bus voltage in which case the drive attempts to stop the drive before
tripping unless bit 2 of Action On Trip Detection (10.037) is set to one. When phase loss is detected by monitoring the ripple
in the DC bus voltage the xx part of the sub-trip is zero.
(1) Input phase loss detection can be disabled when the drive required to operate from the DC supply or from a single
phase supply in Input Phase Loss Detection Mode (06.047).
(2) For a parallel power-module system the rectifier number will be one as it is not possible to determine which rectifier has
detected the fault.
This trip does not occur in regen mode.
Recommended actions:
• Check the AC supply voltage balance and level at full load
• Check the DC bus ripple level with an isolated oscilloscope
• Check the output current stability
• Reduce the duty cycle
• Reduce the motor load
• Disable the phase loss detection, set Pr 06.047 to 2.
• Check for mechanical resonance with the load
Phasing error This indicates that the phase offset angle is incorrect
198
This indicates that the phase offset angle in Position Feedback Phase Angle (03.025) (or M2 Position Feedback Phase
Angle (21.020) if the second motor map is being used) is incorrect if position feedback is being used and the drive is unable
to control the motor correctly.
Recommended actions:
• Check the encoder wiring.
• Check the encoder signals for noise with an oscilloscope.
• Check encoder mechanical coupling.
• Perform an auto-tune to measure the encoder phase angle or manually enter the correct phase angle into Position
Feedback Phase Angle (03.025).
• Spurious Phasing Error trips can sometimes be seen in very dynamic applications. This trip can be disabled by setting
Over Speed Threshold (03.008) to a value greater than zero.
If sensorless control is being used this indicates that significant instability has occurred and the motor has accelerated
without control.
Recommended actions:
• Ensure that the motor parameters are set-up correctly.
• Reduce the speed controller gains.
Power Comms A Power Comms trip indicates a communications problem within the power system of the drive
90
A Power Comms trip indicates a communications problem within the power system of the drive. The reason for the trip can
be identified by the sub-trip number.
* For a parallel power-module system the rectifier number will be one as it is not possible to determine which rectifier has
detected the fault.
Recommended actions:
• Hardware fault – Contact the supplier of the drive
Trip Diagnosis
Source xx y zz
Control
system
00 0 00: Phase loss detected from DC bus ripple
Power
system (1)
Power module
number
Rectifier
number
(2)
00: Phase loss detected directly from the supply
Type of
drive
xx y zz
Control
system
Power module
number
Rectifier
number*
00: Excessive communications errors detected by the rectifier module
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